Missing Template Error When Calling Render

The error

 ForumsController create should work for plist
 Failure/Error: post :create, :name => "My New Shiny Forum", :format => 'plist'
 Missing template forums/create with {:formats=>[:plist], :handlers=>[:builder, :rhtml, :rxml, :erb, :rjs], :locale=>[:en, :en]} in view paths "/Users/maletor/Sites/3md/app/views", ..."
 # ./app/controllers/forums_controller.rb:64:in `create'
 # ./app/controllers/forums_controller.rb:61:in `create'
 # ./app/controllers/forums_controller.rb:52:in `create'
 # ./spec/controllers/forums_controller_spec.rb:222

./spec/controllers/forums_controller_spec.rb:222

post :create, :name => "My New Shiny Forum", :format => 'plist'

./app/controllers/forums_controller.rb#create

def create
  Forum.transaction do 
    if Forum.find_by_name(params[:name])
      head :conflict
      return
    end
    group = Group.create!(:name => params[:name])
    forum = Forum.create!(:name => params[:name])

    respond_to do |format|
      Rails.logger.debug "FORUM: #{forum.inspect}"
      format.json { render :json => forum,开发者_C百科 :status => 201 }
      format.plist { render :plist => forum, :status => 201 }
    end
  end
end

Do not cover any code in controller into transaction, it uses on Model layer by conventions. You can create the group on a callback after_create in Forum model